Type mismatch: String set - Trying to match strings in ruby

Question

I am using authlogic-connect in Rails. I use a simple haml template where I do not want to show authorization providers that are already added.

%h2 My Account %form.authentication_form{:action => connect_path, :method => :post} %fieldset %input{:type => :hidden, :name => :authentication_type, :value => :user} %legend Add another Oauth or OpenID provider. .oauth_providers %ul - %w(google facebook twitter yahoo).each do |name| %li.oauth_provider -unless "{user.authenticated_with}" =~ "{name}" %img{:src => "/images/icons/#{name}.png"} %input{:type => :radio, :id => "#{name}_oauth_provider", :name => :oauth_provider, :value => name} .clearfix %input.submit{:name => :submit, :type => :submit, :value => "Update"}/ 

I encounter an error type mismatch: String. User .authenticated with returns a string.

 def authenticated_with @authenticated_with ||= self.access_tokens.collect{|t| t.service_name.to_s} end 

What is the possible problem?

Stacktrace:

 ActionView::Template::Error (type mismatch: String given): 7: %ul 8: - %w(google facebook twitter yahoo).each do |name| 9: %li.oauth_provider 10: -unless "{user.authenticated_with}" =~ "{name}" 11: %img{:src => "/images/icons/#{name}.png"} 12: %input{:type => :radio, :id => "#{name}_oauth_provider", :name => :oauth_provider, :value => name} 13: .clearfix app/views/users/edit.html.haml:10:in `=~' app/views/users/edit.html.haml:10:in `_app_views_users_edit_html_haml___2062853011_2171399360_0' app/views/users/edit.html.haml:8:in `each' app/views/users/edit.html.haml:8:in `_app_views_users_edit_html_haml___2062853011_2171399360_0' 

Extracted source (around line # 10): - shows an error on line 10

Answer 1

Pass the regular expression as an argument to String # = ~ :

 >> string = "el" >> "hello" =~ /#{string}/ => 1